Something that low elo players should take into their game from watching worlds
SLOW DOWN IF YOU'RE LOSING. Every team does the same thing on the back foot. They stop trying to force fights and instead turn and try and catch enemies out in unbalanced fights (2v1, 3v2, etc). And finally they farm, farm, FARM, and take whatever objectives they can get so the gold advantage is still only maybe 3k behind even if the team kills are 14-4 and that they can keep doing damage in case there is a fight.
Do this rather than being a carry with 108cs and 2/6 at 30 minutes trying to fight at every little hint of a chance he gets because killing other champions is practically how you win this game (it's not)